-
Hard to tell from a picture but could well be.
Artex has a very small amount of azzy in it (around 1-2%). There are DIY products to remove it or cover it over (extra thick paint). Removal is considered pretty safe as the way it's removed keeps the fibres encapsulated. Having said that when I come across it at work I tend to call in specialists so can totally understand if you would prefer to do so.
I assume that's what it is, although some of it might just be textured paint.